I think for this particular park it's pretty cheap..around $25 for four hours, but I'm not 100% sure. The best way to find out is to go to the New Hanover County parks and rec site...you can even reserve online if doing it more than a week in advance. There is also a phone number supplied to call and reserve.
I think it is $50
Probably you need to check with New Hanover Parks and Recreation
Thanks! Your answer is awaiting moderation.